Start gifting
Libro.fm for Business
Start a membership, get two free audiobooks
Almost ready!
In order to save audiobooks to your Wish List you must be signed in to your account.
Log in Create account
Limited-time offer
Get two free audiobooks when you make the switch!
Now’s a great time to shop indie. When you start a new membership supporting local bookstores with promo code SWITCH, we’ll give you two bonus audiobook credits at sign-up.
Make the switch
Gift audiobook credit bundles
You pick the number of credits, your recipient picks the audiobooks, and your local bookstore is supported by your purchase.
Start giftingShadows of Forgotten Ancestors
This audiobook uses AI narration.
We’re taking steps to make sure AI narration is transparent.
Learn moreWorld renowned scientist Carl Sagan and acclaimed author Ann Druyan have written a Roots for the human species, a lucid and riveting account of how humans got to be the way we are. It shows with humor and drama that many of our key traits--self-awareness, technology, family ties, submission to authority, hatred for those a little different from ourselves, reason, and ethics--are rooted in the deep past, and illuminated by our kinship with other animals.
Astonishing in its scope, brilliant in its insights, and an absolutely compelling read, Shadows of Forgotten Ancestors is a triumph of popular science.
Introductory music from the original score for COSMOS: A SpaceTime Odyssey composed by Alan Silvestri, used with permission from Cosmos Studios, Inc. and Chappers Music. All rights reserved. Special thanks to Fuzzy Planets, Inc.
Carl Sagan (1934-1996) was the Director of Cornell University’s Laboratory for Planetary Studies. He played a leading role in the American space program and was an adviser to NASA since its inception. He briefed the Apollo astronauts before their flights to the Moon, and was an experimenter on the Mariner, Viking, Voyager, and Galileo expeditions to the planets. He helped solve the mysteries of the high temperatures of Venus (answer: massive greenhouse effect), the seasonal changes on Mars (answer: windblown dust), and the reddish haze of Titan (answer: complex organic molecules). For his work, Dr. Sagan received the NASA medals for Exceptional Scientific Achievement, and the Pulitzer Prize for The Dragons of Eden. His 1980 television series Cosmos: A Personal Voyage won the Emmy and Peabody awards. The National Science Foundation declared that his “research transformed planetary science… his gifts to mankind were infinite.”